day 62 part 2

main.dart

List<List<dynamic>> updateInventory(
    List<List<dynamic>> inventoryOne, List<List<dynamic>> inventoryTwo) {
  Map<String, int> inventoryMap = {};
  inventoryOne.forEach((List item) {
    inventoryMap[item[1]] = item[0];
  });
  inventoryTwo.forEach((List item) {
    if (inventoryMap.containsKey(item[1])) {
      inventoryMap[item[1]] += item[0];
    } else {
      inventoryMap[item[1]] = item[0];
    }
  });
  print(inventoryMap);
  List<List<dynamic>> output = [];
  inventoryMap.forEach((key, value) => output.add([value, key]));
  output.sort((List itemOne, List itemTwo) => itemOne[1].compareTo(itemTwo[1]));
  print(output);
  return output;
}